What is the effect of QT_BEGIN_NAMESPACE?
QT_BEGIN_NAMESPACE
class QLineEdit;
QT_END_NAMESPACE
If I don't use the class declaration like that, will any problem occur?
QT_BEGIN_NAMESPACE
and QT_END_NAMESPACE
are preprocessor macros and they are defined in QtGlobal as:
#define QT_BEGIN_NAMESPACE namespace QT_NAMESPACE {
#define QT_END_NAMESPACE }
But: those two macros only have any effect when Qt was configured and built using the -qtnamespace
option, which allows you to build Qt inside a user-defined namespace.
So: if you don't use (or plan on using) a Qt library which was built this way (per default, the Qt library resides in the global namespace), omitting the QT_BEGIN_NAMESPACE
and QT_END_NAMESPACE
won't lead to any problems.
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